Reference article
Liberty Spikes (Duck Life 2)
Liberty Spikes is a cosmetic hat or hairstyle for the player’s duck.
How to obtain
Win 
Egypt Area Final, then select this appearance for free in the 
Duck Shop.
Effect
Cosmetics change appearance without affecting racing skills or energy.
Name
Liberty Spikes is a spiked hairstyle. It is also called Punk Hair by fans.